From: Jakub Kicinski <jakub.kicin...@netronome.com> Date: Thu, 18 Feb 2016 20:38:13 +0000
> Since change_mtu() can fail and leave us with netif_running() > returning true even though all rings were freed - we should > look at NFP_NET_CFG_CTRL_ENABLE flag to determine if device > is really opened. > > Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com> This is exactly why I don't like how you are doing your MTU change at all. You must not make the device inoperative if you simply cannot perform the MTU change. I'm pretty sure I've told you this already, this whole ->close(), MTU change, ->open() OOPS THAT FAILED sequence is a non-starter. You can't do this. You are leaving the netdev object in an illegal state when this happens. You must return from ->change_mtu() with the device in the UP and running state if you cannot make the MTU change. I don't care how invasive it is, you must fix this properly if you want to fix this because as-is this patch series is a cure worse than the disease. I'm not applying any of your currently submitted changes, both for net and net-next, sorry.
